文章来源：http://blog.csdn.net/21aspnet/archive/2004/10/27/155159.aspx
星期五 2005年4月8日
ASP.NET的实时天气及24小时天气预报(C#) 修改其中的url获得其他城市的天气情况
如广州为：
http://weather.yahoo.com/forecast/CHXX0037_c.html
注意仅适用于获得yahoo上的天气预报
GetWeather.aspx
<%@ Page language="c#" Codebehind="GetWeather.aspx.cs" AutoEventWireup="false" Inherits="test.GetWeather" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>GetWeather</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="java script">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="GetWeather" method="post" runat="server">
<FONT face="宋体">
<P>
<asp:Label id="lblWeather" runat="server">Weather</asp:Label></P>
<P>
<asp:Button id="btnGet" runat="server" Text="Get Weather"></asp:Button></P>
<P>
<asp:Label id="Weather2" runat="server">24小时天气</asp:Label></P>
<P>
<asp:Button id="btnGet2" runat="server" Text="天气预报"></asp:Button></P>
</FONT>
</form>
</body>
</HTML>
getWeather.aspx.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Net;
using System.IO;
namespace test
{
public class GetWeather : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label lblWeather;
protected System.Web.UI.WebControls.Label Weather2;
protected System.Web.UI.WebControls.Button btnGet2;
protected System.Web.UI.WebControls.Button btnGet;
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
}
Web Form Designer generated code
private void btnGet_Click(object sender, System.EventArgs e)
{
WebRequest wreq=WebRequest.Create("http://weather.yahoo.com/forecast/CHXX0037_c.html");
HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();
string HTML ="";
Stream s=wresp.GetResponseStream();
StreamReader objReader = new StreamReader(s);
string sLine = "";
int i = 0;
while (sLine!=null)
{
i++;
sLine = objReader.ReadLine();
if (sLine!=null)
HTML += sLine;
}
String temp= "";
int start,stop;
start = HTML.IndexOf("<!-- CURCON-->",0,HTML.Length);
stop = HTML.IndexOf("<!-- END CURCON-->",0,HTML.Length);
temp = HTML.Substring(start, stop - start);
start = temp.IndexOf("<b>");
stop = temp.IndexOf("</b>");
string degree = temp.Substring(start+3,stop - start -3);
start = temp.IndexOf("<img");
stop = temp.IndexOf("</td>",start);
string img = temp.Substring(start,stop - start);
lblWeather.Text = degree + "<br>" + img;
}
private void btnGet2_Click(object sender, System.EventArgs e)
{
WebRequest wreq=WebRequest.Create("http://cn.weather.yahoo.com/CHXX/CHXX0037/index_c.html");
HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();
string HTML ="";
Stream s=wresp.GetResponseStream();
StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));
string sLine = "";
int i = 0;
while (sLine!=null)
{
i++;
sLine = objReader.ReadLine();
if (sLine!=null)
HTML += sLine;
}
String temp= "";
int start,stop;
start = HTML.IndexOf("<table border=0 cellpadding=2 cellspacing=1 bgcolor=9999cc width="85%">",0,HTML.Length);
stop = HTML.IndexOf("</table>",start)+8;
temp = HTML.Substring(start, stop - start);
Weather2.Text = temp;
}
}
}
